package main
import "fmt"
func Factorical(n uint64)(result uint64) {
	if(n>0){
		result = n * Factorical(n-1)
		return result
	}
	return 1
}
func main() {
	var i int=15
	fmt.Printf("%d 的阶乘是 %d\n",i,Factorical(uint64(i)))
	
}